Attachment-plug.



A. M. BRADLEY.

ATTACHMENT PLUG. APPLICATION FILED 1111111.13, 191s.

Patented Dec. 16,1913.

Inventor Attorneys UNTER@ STATES? FATEFNT FFQFJI.

ALBERT M. BRADLEY, OF NAPOLEON, OHIO.

ATTACHMENT-PLUG.

Specification of Letters Patent.

vPatented Dec. 16, 1913.

.Application tiled March 13, 1913. Serial No. 754,117.

the necessity of rotating the same as is the` usual custom and which is especially adapted to be connected to conductors leading from light extensions or fans vor to be connected directly to and form a part of an incandescent lam plug.

A further object of the present invention is the provision of manually controlled means to be depressed by the thumb and fore linger of the hand during the insertion of the attachment plug, the connecting medium of the same being normally extended to when released, engage the walls of the lamp,

socket and thus complete the electrical circuit, similarly to the usual attachment plug or lamp plug, but without the necessity of rotating as is now the present practice.

W ith the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, ity being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the drawings-Figure 1 is a perspective view of the attachment plug in its normal position before insertion within a lamp socket. Fig. 2 is a vertical sectional view therethrough showing the socket engaging member collapsed during the insertion of the attachment plug. Fig. 3 is a similar view to Fig. 2 showing the same attached to a lamp socket. Fig. 4 is a bottom plan view with the cover removed.

Referring to the drawings, the numeral 1 designates the enlarged head of the main carrying member, which is made of insulating material, preferably porcelain, having the lower cavity 2 for the respective wire connections, as will presently appear and provided with the detachable cap 3 held in place by means of the screws 4. An insulatlng stem 5 is disposed concentrically to and from the side opposite to the cavity and has.

disposed concentrically therethrough the metal rod 5', who-se upper end is disposedto be engaged with the' concentric circuit connection of the socket S. Mounted upon the upper end of the insulating member 5, and insulated from the rod 5 is the 'socket 'engaging expansible member 6, which is provided with the opposite diametrically disposed V-shaped incisions 6 and with the spring 7 which normally tends to hold the lower free ends extended for engagement with the threaded portion of the socket S. The outer surface of these extended portions are screw threaded as at 8 to engage the threads of the socket. Extending from the lower edge of the socket engaging portions are the tangs or vhandles 9, which project into the transverse slots a of the slidably mounted linger engaging blocks 10 each one o-f which is mounted for sliding movement in the guides 11 of the supporting member.

-These linger engaging members are made preferably of insulating material either of hard paper fiber or hard rubber, and. when compressed by the thumb and lfore finger partially collapse the socket engaging members so that the parts will assume the position, as shown in Fig. 2, to, when released, assume the position, as shown in Fig. 3, thus establishing the necessary electrical connection between the socket S and the attachment plug, and Without the usual rotary movement imparted to the attachment plug due to the coacting threads of the socket and attachment plug.

It will thus be seen that withthis form of attachment plug that the same may .be readily attached to and detached from the usual form of lamp socket without the necessity of constructing such socket and that where the device is used in connection with conductors for leading current to a fan or light extension, that the disagreeable twisting of the wires attendant to the usual insertion, by rotating the attachment plug, is entirely obviated, the present attachment plug being simplyvengaged and removed by a push and pull movement.

The lower end of the concentric rod is provided with the conductor attaching binding post 11, while a binding plate 12 is mounted in the cavity of the member l and has led therethrough the conductor 13 which is engaged at 14 to the expansible member of the attachment plug. By this means the current is properly led from the lamp socket through the two conductors C and to the fan or lamp, orv in tact any other attachment to which the same is connected, as for instance motors and the like.

What is claimed is;

1. An attachment plug, including a body of insulation having a gripping portion pro# vided with oppositely disposed grooves, a socket contact member carried by the body I and having two oppositely disposed sections,

a spring within the socket and holding the free ends of the sections extended, and two linger blocks connected one to the terminal .of each section and slidably mounted in the groovesv for collapsing the sections, said blocks being extended by the sections when released. y i

2. An attachment plug, including a body of insulation having a gripping portion, a socket contact member carried by the body and having two oppositely disposed sections, a spring disposed within the socket and engaging the sections to hold said sections extended, each section having a reduced terminal, and two finger bloc-ks one engaging each terminal of the sections and slidably mounted in the grooves, said blocks being moved toward each other to collapse the sections and themselves being moved outwardly by the-sections when released.

3. An attachmentplug, includingsa body of insulation having a gripping portion provided with oppositely disposed grooves', a socket contact member carried by the body and having oppositely disposed sections, a spring disposed within the socket and engaging the sections to hold said sections extended, each section having a reduced terminal, and two finger blocks engaging the terminals of the sections and slidably mounted in the grooves whereby the blocks are moved inwardly, for collapsing the sections and are held resiliently outwardly by the sections.

In testimony that I claim the foregoing as my own, I have hereto aiixed my signature in the presence of two witnesses.

ALBERT M. BRADLEY.

Witnesses:

UsHER V. FISER, C. J. SHUMAKER. 

